Differentiate between the two types of manufacturing process variations: $(1)$ random and $(2)$ assignable. Consider the following statements, and identify which ones accurately describe each type.

Group of answer choices

Random variations result from intrinsic variability in the process and are inherent in all processes.

Random variations can be avoided by eliminating human variability.

Random variations typically form a skewed statistical distribution.

Assignable variations indicate normal operating conditions.

Assignable variations result from factors such as operator mistakes and defective raw materials.

Random variations occur only when the process is not operating normally.